/*

 * Copyright 2017 Google Inc.

 *

 * Use of this source code is governed by a BSD-style license that can be

 * found in the LICENSE file.

 */

#ifndef GrBackendSemaphore_DEFINED

#define GrBackendSemaphore_DEFINED

#include "include/gpu/GrTypes.h"  // IWYU pragma: keep

#include "include/private/base/SkAPI.h"

#include "include/private/base/SkAnySubclass.h"

#ifdef SK_DIRECT3D

#include "include/private/gpu/ganesh/GrD3DTypesMinimal.h"

#endif

#include <cstddef>

class GrBackendSemaphoreData;

/**

 * Wrapper class for passing into and receiving data from Ganesh about a backend semaphore object.

 */

class SK_API GrBackendSemaphore {

public:

    // The GrBackendSemaphore cannot be used until either init* is called, which will set the

    // appropriate GrBackend.

    GrBackendSemaphore();

    ~GrBackendSemaphore();

    GrBackendSemaphore(const GrBackendSemaphore&);

    GrBackendSemaphore& operator=(const GrBackendSemaphore&);

#ifdef SK_DIRECT3D

    void initDirect3D(const GrD3DFenceInfo& info) {

        fBackend = GrBackendApi::kDirect3D;

        this->assignD3DFenceInfo(info);

        fIsInitialized = true;

    }

#endif

    bool isInitialized() const { return fIsInitialized; }

    GrBackendApi backend() const { return fBackend; }

#ifdef SK_DIRECT3D

    bool getD3DFenceInfo(GrD3DFenceInfo* outInfo) const;

#endif

private:

    friend class GrBackendSemaphorePriv;

    friend class GrBackendSemaphoreData;

    // Size determined by looking at the GrBackendSemaphoreData subclasses, then

    // guessing-and-checking. Compiler will complain if this is too small - in that case,

    // just increase the number.

    inline constexpr static size_t kMaxSubclassSize = 24;

    using AnySemaphoreData = SkAnySubclass<GrBackendSemaphoreData, kMaxSubclassSize>;

    template <typename SemaphoreData>

    GrBackendSemaphore(GrBackendApi api, SemaphoreData data) : fBackend(api), fIsInitialized(true) {

        fSemaphoreData.emplace<SemaphoreData>(data);

    }

#ifdef SK_DIRECT3D

    void assignD3DFenceInfo(const GrD3DFenceInfo& info);

#endif

    GrBackendApi fBackend;

    AnySemaphoreData fSemaphoreData;

    union {

        void* fPlaceholder;  // TODO(293490566)

#ifdef SK_DIRECT3D

        GrD3DFenceInfo* fD3DFenceInfo;

#endif

    };

    bool fIsInitialized;

};

#endif